@prefix qx8: <http://data.loterre.fr/ark:/67375/QX8> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

qx8:-VGMZFRM2-Z
  skos:prefLabel "minéral"@fr, "mineral"@en ;
  a skos:Concept ;
  skos:narrower qx8:-RZG1KB9B-Z .

qx8:-RZG1KB9B-Z
  skos:prefLabel "opal"@en, "opale"@fr ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Opal>, <http://data.loterre.fr/ark:/67375/26L-MPB300L6-7>, <https://fr.wikipedia.org/wiki/Opale> ;
  skos:inScheme qx8: ;
  skos:definition "L'opale est un minéraloïde composé de silice hydratée, de formule SiO2·n H2O, avec des traces d'aluminium, de potassium, de sodium et de calcium principalement. La teneur en eau est habituellement comprise entre 3 et 9 %, mais peut (rarement) dépasser 15 %. L'opale comporte parfois des cristallites de cristobalite, montrant parfois des défauts d'empilement de type tridymite. (Adapté de : <a href=\"https://fr.wikipedia.org/wiki/Opale\">https://fr.wikipedia.org/wiki/Opale</a>)"@fr, "Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. (Adapted from: <a href=\"https://en.wikipedia.org/wiki/Opal\">https://en.wikipedia.org/wiki/Opal</a>)"@en ;
  skos:broader qx8:-VGMZFRM2-Z ;
  skos:altLabel "opaline"@fr ;
  a skos:Concept .

qx8: a skos:ConceptScheme .